File: test-serial-read.py

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#!/usr/bin/env python

# This test has to run on a Raspberry Pi connected throw a USB
# to serial adapter to a laptop.

from __future__ import print_function

import time
import serial

ser = serial.Serial(
  port='/dev/ttyUSB0',
  baudrate = 9600,
  timeout=0
)
          
while True:
  data = ser.read(9)
  if len(data) > 0:
    print('Got:', len(data), 'data:', data)

  time.sleep(0.5)
  print('not blocked')

ser.close()